<template>
    <view>
        <view class="scroll-view-container">
            <scroll-view scroll-y="true" :style="{height: wh+'px'}" class="left-scroll-view">
                <!-- <view :class="['left-scroll-view-item',active==i?'active':'']" v-for="(item,i) in cateList" :key="item.cat_id">{{item.cat_name}}</view> -->
                <view :class="'left-scroll-view-item'+' '+(active===i?'active':'')" v-for="(item,i) in cateList" :key="item.cat_id" @click="activeChanged(i)">{{item.cat_name}}</view>
            </scroll-view>
            <scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
                <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="item2.cat_id">
                    <view class="cate-lv2-title">
                        /{{item2.cat_name}}/
                    </view>
                    <view class="cate-lv3-list">
                        <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="item3.cat_id" @click="gotoGoodsList(item3)">
                            <image :src="item3.cat_icon.replace('dev','web')" mode="widthFix"></image>
                            <text>{{item3.cat_name}}</text>
                        </view>
                    </view>
                </view>
            </scroll-view>
        </view>
    </view>
</template>

<script>
    export default {
        data() {
            return {
                wh:0,
                cateList:[],
                active:0,
                cateLevel2:[],
                scrollTop:0
            };
        },
        onLoad() {
            this.wh=uni.getSystemInfoSync().windowHeight
            this.getCateList()
        },
        methods:{
            async getCateList(){
                try{
                    const res=await uni.$request.get('/api/public/v1/categories')
                    console.log(res);
                    if(res.meta.status!=200){
                        return uni.$showMsg()
                    }
                    this.cateList=res.message
                    this.cateLevel2=res.message[0].children
                }catch(e){
                    uni.$showMsg({title:"网络或服务器异常!"})
                    console.log(e);
                }
            },
            activeChanged(i){
                this.active=i
                this.cateLevel2=this.cateList[i].children
                this.scrollTop=this.scrollTop==0?1:0
                // this.scrollTop=0
            },
            gotoGoodsList(item3){
                uni.navigateTo({
                    url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
                })
            }
        }
    }
</script>

<style lang="scss">
    .scroll-view-container{
        display: flex;
        .left-scroll-view{
            width: 120px;
            .left-scroll-view-item{
                line-height: 60px;
                font-size: 12px;
                text-align: center;
                background-color: #f7f7f7;
                &.active{
                    background-color: #fff;
                    position: relative;
                    &::before{
                        content:'';
                        display: block;
                        background-color: #c00000;
                        width: 3px;
                        height: 30px;
                        position: absolute;
                        top: 50%;
                        transform: translateY(-50%);
                    }
                }
            }
        }
        .cate-lv2-title{
            font-style: 12px;
            font-weight: bold;
            text-align: center;
            padding: 15px 0;
        }
        .cate-lv3-list{
            display: flex;
            flex-wrap: wrap;
            .cate-lv3-item{
                display: flex;
                flex-direction: column;
                justify-content: center;
                align-items: center;
                width: 33%;
                margin-bottom: 10px;
                image{
                    width: 60px;
                    height: 60px;
                }
                text{
                    font-size: 12px;
                }
            }
        }
    }
    
</style>
